Why do you want to specify newlines explicitly as \n? If you are generating a significant document, why are the strings even part of the code file? Separate the text from the code and you can send out different languages; your designers can rearrange the message with insignificant change to the program.
Put message snippets into separate text files, if you need various options, laid out exactly as you want it to look. If you want to interpolate data in the middle of standard text, use one of the templating modules, some of them work for text, not just html.
As Occam said: Entia non sunt multiplicanda praeter necessitatem.